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Adjust the AC side voltage to the rated input voltage, minimum and maximum values and measure the modulation index. The closed control system will automatically adjust the modulation index to reach the reference DC-link reference voltage of 810 V without load.
Anchor Table6Table4Table6 Table4
Input AC voltage | Modulation index | ||||
430 V |
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480 V |
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530 V |
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Table 64: Case A Question 1 recorded values
Record the line current (fundamental), and real and reactive power supplied to the rectifier, for all 3 cases by adjusting the ac side voltage to the rated input voltage, minimum and maximum values. Set the power factor reference to unity.
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Input AC voltage |
| Real power | Reactive power | Power factor | ||||
430 V |
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480 V |
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530 V |
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Table 75: Case A Question 2 recorded values
For the rated voltage input, vary the input power factor from 0.75 leading to 0.75 lagging and record the values in Table 8.
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Power factor | Grid voltage V_grid (pu) | Rectifier input current I_Rect (pu) | Rectifier input voltage V_Rect (pu) | Active power (W) | Reactive power (Var) | Apparent power (VA) |
pf = 0.75 (lagging) | mag = phase = | mag = phase = | mag = phase = |
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pf = 1 (unity) | mag = phase = | mag = phase = | mag = phase = |
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pf = -0.75 (leading) | mag = phase = | mag = phase = | mag = phase = |
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Table 86: Case A Question 3 recorded values
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Plot and illustrate the modulation index M in terms of the control signal and the amplitude of the carrier. Record and plot the inverter transfer characteristics, line-line output voltage (fundamental) versus modulation index, in the linear and over-modulation regions.
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Modulation index |
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0.25 |
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0.5 |
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0.75 |
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1 |
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1.25 |
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1.5 |
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2.0 |
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3.0 |
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10.0 |
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Table 97: Case A Question 4 recorded values
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Record and plot the inverter transfer characteristics, line-line output voltage (fundamental) versus modulation index, in the linear and over-modulation regions. Record the modulation index required to provide 480V given a 700V DC link.
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Modulation index |
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0.25 |
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0.5 |
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0.75 |
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1 |
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1.25 |
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1.5 |
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2.0 |
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3.0 |
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10.0 |
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| 480 V |
Table 108: Case B Question 1 recorded values.
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